File 0313-target-i386-define-md-clear-bit.patch of Package qemu.12301
From 37d50810880df6bd59c9d725a00e072e16528ee9 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 1 Mar 2019 21:40:52 +0100
Subject: [PATCH] target/i386: define md-clear bit
md-clear is a new CPUID bit which is set when microcode provides the
mechanism to invoke a flush of various exploitable CPU buffers by invoking
the VERW instruction. Add the new feature.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[BR: BSC#1111331 CVE-2018-12126 CVE-2018-12127 CVE-2018-12130
CVE-2019-11091]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
target-i386/cpu.c | 2 +-
target-i386/cpu.h | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index b8db08f6bf..17d2a7e4a6 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -265,7 +265,7 @@ static const char *cpuid_7_0_ebx_feature_name[] = {
static const char *cpuid_7_0_edx_feature_name[] = {
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
- NULL, NULL, NULL, NULL,
+ NULL, NULL, "md-clear", NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 33050a00d3..69131a414e 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -576,6 +576,7 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
#define CPUID_7_0_EBX_AVX512ER (1U << 27) /* AVX-512 Exponential and Reciprocal */
#define CPUID_7_0_EBX_AVX512CD (1U << 28) /* AVX-512 Conflict Detection */
+#define CPUID_7_0_EDX_MD_CLEAR (1U << 10) /* Microarchitectural Data Clear */
#define CPUID_7_0_EDX_SPEC_CTRL (1U << 26) /* Speculation Control */
#define CPUID_7_0_EDX_SPEC_CTRL_SSBD (1U << 31) /* Speculative Store Bypass Disable */